Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plan - Stock Options Activity (Details)

v3.19.3.a.u2
Stock Incentive Plan - Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Options      
Beginning balance (in shares) 3,305,000 3,834,000 3,971,000
Granted (in shares) 1,330,000 518,000 390,000
Exercised (in shares) (916,000) (909,000) (401,000)
Forfeited (in shares) (210,000) (87,000) (41,000)
Expired (in shares) (4,000) (51,000) (85,000)
Ending balance (in shares) 3,505,000 3,305,000 3,834,000
Options exercisable (in shares) 1,528,000    
Options expected to vest (in shares) 1,977,000    
Weighted-Average Exercise Price      
Beginning balance (in usd per share) $ 8.050 $ 7.367 $ 7.300
Granted (in usd per share) 14.026 10.878 6.061
Exercised (in usd per share) 7.362 7.367 4.935
Forfeited (in usd per share) 8.070 4.726 6.421
Expired (in usd per share) 9.904 9.146 10.157
Ending balance (in usd per share) 10.524 $ 8.050 $ 7.367
Options exercisable (in usd per share) 8.757    
Expected to vest (in usd per share) $ 11.889    
Outstanding, remaining contractual term 6 years 7 months 6 days    
Exercisable, remaining contractual term 4 years 4 days    
Expected to vest, remaining contractual term 8 years 9 months 4 days    
Outstanding, aggregate intrinsic value $ 24,455    
Exercisable, aggregate intrinsic value 13,356    
Expected to vest, aggregate intrinsic value $ 11,098